Improvement in tools for



bead thereon.

'- To enable those skilled in theart to fully' UNITED STATES PATENTOFFICE.-

AMos Bonn., oF nookDALnnEW-Youa.

IMPROVEMENT IN TooLs Fol?.` TURNING-LATHES'.

Specification fori-ning part of Lettera Patent N o. '4 IAS, datedFebruary 9, 1864.

.To all lwhom t may concern/.-

Be it known that I, AMos A. BURR, of Rockdale, in the county of Chenangoand State of New4 York,'have invented a new a'nd usefultool forturning-lathes, the saine being designed 'for cutting spiralbeads onturned` articles; and I do'v hereby declare that the following isa full,clear, and exactdescription of the same, reference being had to theyaccompanying drawings, making a part o f this specification, iuwhich-Figure l is an external side View of my in- -vention; Fig.- 2, a sectionof the same, taken 1n the line .t at, Fig. l; Fig. 3,2medgeview of thesaine. l

` Similar letters `of reference indicate corresponding parts in theseveral figures.

shown clearly in Fig. 2.

there'is attached a cutter, D, of

This mvention'relates tov4 a 'new and useful A tool for cutting spiralbeads on wooden articles, such as f rniture-legs, Snc., turned in alathe and -while being centered and rotated in the same.

` The invention consists in theemployment or us'eof two jaws attachedeither to an elastic bar or to shanks connected. by a joint to 'admitofthe jaws being opened and closed,

said jaws having curved or'sem-icircular recesses made in them, in whichscrewthreads arec'ut, and oney of the jaws having a cutter' to it, theabove parts being used in connection with a spring and and a guardAattached all arranged insuch a manner that when the tool is applied tothev work or article inthe lathe and the article rotated the tool willfeed- `itself along on the art understand and constructymy invention, Iwillproceed' to' describe it.

ielc and cut the spiral.

VA A represent two jaws-,which may be of quadrilateral or' anapproximate forni in their transverse section and constructed of metal.Wrought-iron, steel or malleable cast-iron would answer. These twobarsare connected' to the ends of an elastic-plate, B,'bent i`n U 4form, asshown clearly in Fig. l. This plate' B has a tendeneyftopress the jaws Atogether. In the inner sides of thejaws AAA there are curved orsemicircular recesses ,'one in each, and each recess has a screw,^b, cutin it, as

These two recesses a a' coincidek with each other when the jaws A A arepressed together in contact, and they form a cireularpr ellipticalopening.

One of the jaws A has attaehedto its inner side, near its outer end., acurved or seg 'nient rod, C, which passes through an opening inthe otherjaw1 This rod C serves as' a guide for the jaws, preventing the samefrom moving' laterally' out of a proper .relative position with eachother.. i

To one-of the jaws A, at. one 'side of it, other form, according to theshape of the bead to be cut. 'This cutter is placed in such a positionthat its edge is by the side ofthe recess a, as-shown 'clearly in-Fig. 1. To this same jaune.. there Ais also. aLtaeheILatone si de, nearthe cutter D, a' plate, E', .which serves as a guard. or'gage to preventthecutter from pen-- etrating or cutting too deep into the article beingoperated upon.

-The operation is as follows: The article shown'in red outline inFigsl-.l and 3, after being turned inthe lathe ofthe desired form,

has the tool applied to it, the jaws A A being distended or forcedapart, so that` they may grasp the article, thelatter fittingv in therel cesses-a a,1 s`o that the'screwsb willbear upon the-article at oneend of it. -The arti-cle '1s then rotated, the -tool being held by thehand* ofthe operator. As the article "rotates, the

tool is fed along on the article by the screwthreads b; and the cutter)D cutst-he' 4spiral head, the guard or'gage E preventing the cutterfrom penetrating too deeplyintothe article.- .The elasticplate B admitsof thejaws A Ayie'lding or giving to suit the inequalities of thearticle over which it passes. v

This tool may be constructedfat avery -modf erate cost, and will provevaluable to every wood-turning establishment where fancy orornamental'turning is done, as it will enable quite inexperiencedpersons to perform' work hithertorequir'ed to be done by expert hands'.

I would remark that. instead, of the elastic plate B rigid Shanks may beused', connected by a joint, and a spiralspring placed lp'on thesegment-rod C for the purpose of allowing thejawsto yield or giveto-.fthe inequalities of surface over which theyfm-ay pass. This gougeor modification, 11oxvever, wou1d be an equivavided with a entier, D,and used either vwith lent of the construction irst described' and orwithout the segment-rod C. and guard or illustrated. 4 gage E, `co forma new and useful tool for the Having-thusldeseribed-my invention, whatI.. lpurpose specified. claim -as new, and desire to secure byLetrecesses a a; having screw-threads b formed F THos. S. JpDoUGLAss,

'or out on them.y 'oneof said ,jaws being pioi D: ROBERTSON.

